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#### 2.1.3 GLMdb

The genetic linkage map database is simply organized as a set of plain text files each corresponding to a single genetic linkage map. The link between the experiment table and the genetic map files is done by using the same stem file name than the name of the mapping experiment declared in the column map of the experiment table. For example the genetic linkage map related to the mapping experiments ``exp1`' will be stored in a file named `exp1.txt`. Here a genetic linkage map is represented by a table with the following fields:

- group (string) : the linkage group name.
- marker (string) : the name of the marker.
- position (numeric) : the position of the marker on the linkage group the unit of which is declared in the experiment table.

For example, the genetic linkage map file for the mapping experiments `exp1` would be

         group	marker	position
         1    	lgm0392	0
         1    	bnlg1178	47.7
         1    	ts2	102.7
         1    	bnlg1884	137.5
         1    	lgm1234	179.3
         1    	lgm1465	293.2
         2    	bnlg1092	0
         2    	bnlg1017	26.8
         2    	lgm0701	37.4
         2    	lgm0653	165
         2    	bnlg1520	190.8
         2    	dupssr32	218.1
         3    	bnlg1904	0
         3    	bnlg1035	36.6
         3    	bnlg1063	63.1
         3    	bnlg1182	140.2
         3    	dupssr8b	161.2